<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>bootstrap4网格布局</title>
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <link rel="stylesheet" href="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
    <style>
        .list{
            background: red;
            color: #fff;
            margin-bottom:20px;
            height: 100px;
        }
    </style>
</head>
<body>
<div class="container text-center">
    <div class="row">
        <div class="col-md-4">
            <div class="list">内容</div>
        </div>
        <div class="col-md-4">
            <div class="row">
                <div class="col-6"><div class="list">内容</div></div>
                <div class="col-6"><div class="list">内容</div></div>
                <div class="col-6"><div class="list">内容</div></div>
                <div class="col-6"><div class="list">内容</div></div>
            </div>
        </div>
        <div class="col-md-4">
            <div class="list">内容</div>
        </div>
    </div>
</div>
</body>
</html>